*,div,table,a,p,input,ol,ul,li,img,button,form,tr,td{
    margin: 0;
    padding: 0;
}
.header{
    height: 400px;
    background: url(../img/header.jpg) no-repeat;
    background-position: center center;
    background-size: cover;
}
.main>.nav{
    height: 50px;
    line-height: 50px;
    font-size: 18px;
}
.main>.content{
    height: 800px;
    font-size: 22px;
}
.footer{
    height: 50px;
    line-height: 50px;
    background: black;
    color: white;
    text-align: center;
}
.odd{
  background: black;
    color: white;
}
.even{
    background: red;
    color: white;
}